Two-dimensional Fourier-transform spectroscopy of potassium vapor

Dai, Xingcan; Bristow, Alan D.; Karaiskaj, D.; Cundiff, Steven T.

doi:10.1103/physreva.82.052503

Cited by 55 publications

(33 citation statements)

References 43 publications

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“…It can be seen that in the low-strain sample the X H has larger oscillator strength than X L , and that X L -X H and X H -X L are equal in magnitude, with strengths that are approximately the average of X L and X H . This result is reminiscent of the coherent response of three-level atomic vapors, 49 indicating a symmetric coupling between the two exciton species. 26 On the other hand, in the high-strain sample the lower energy exciton X L is stronger than X H and the relative strengths of the off-diagonal features become asymmetric, with X L -X H increasing by approximately the same amount that X H -X L decreases.…”

Section: Resultsmentioning

confidence: 63%

Role of strain on the coherent properties of GaAs excitons and biexcitons

et al. 2016

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Polarization-dependent two-dimensional Fourier-transform spectroscopy (2DFTS) is performed on excitons in strained bulk GaAs layers, probing the coherent response for differing amounts of strain. Biaxial tensile strain lifts the degeneracy of heavy-hole (HH) and light-hole (LH) valence states, leading to an observed splitting of the associated excitons at low temperature. Increasing the strain increases the magnitude of the HH/LH exciton peak splitting, induces an asymmetry in the off-diagonal interaction coherences, increases the difference in the HH and LH exciton homogenous linewidths, and increases the inhomogeneous broadening of both exciton species. All results arise from strain-induced variations in the local electronic environment, which is not uniform along the growth direction of the thin layers. For cross-linear polarized excitation, wherein excitonic signals give way to biexcitonic signals, the high-strain sample shows evidence of bound LH, HH, and mixed biexcitons.

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Section: Resultsmentioning

confidence: 63%

Role of strain on the coherent properties of GaAs excitons and biexcitons

et al. 2016

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“…In this section we present simulations for representative individual terms and describe how the signals compare to both the femtosecond-pulse 2D spectrum [27-29, 32, 37-46, 48, 51, 140, 141] and the less-common frequencydomain 2D spectrum (a collection of transient-absorption measurements using a narrowband but tuneable pump), which has been performed in the infrared [142][143][144] and ultraviolet [145], but to the best of our knowledge not in the visible. We will relate our results to both the standard femtosecond 2D ES measurement-the sum of rephasing and nonrephasing components performed at a series of τ 2 times-and the two-quantum femtosecond 2D ES measurement [31,[146][147][148][149][150][151].…”

Section: Discussionmentioning

confidence: 99%

Two-Dimensional Electronic Spectroscopy Using Incoherent Light: Theoretical Analysis

Turner

Howey²,

Sutor³

et al. 2012

J. Phys. Chem. A

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Electronic energy transfer in photosynthesis occurs over a range of time scales and under a variety of intermolecular coupling conditions. Recent work has shown that electronic coupling between chromophores can lead to coherent oscillations in two-dimensional electronic spectroscopy measurements of pigment-protein complexes measured with femtosecond laser pulses. A persistent issue in the field is to reconcile the results of measurements performed using femtosecond laser pulses with physiological illumination conditions. Noisy-light spectroscopy can begin to address this question. In this work we present the theoretical analysis of incoherent two-dimensional electronic spectroscopy, I(4) 2D ES. Simulations reveal diagonal peaks, cross peaks, and coherent oscillations similar to those observed in femtosecond two-dimensional electronic spectroscopy experiments. The results also expose fundamental differences between the femtosecond-pulse and noisy-light techniques; the differences lead to new challenges and new opportunities.

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“…12 Besides the examples given above for semiconductor materials, this powerful technique has been successfully applied to molecules, [13][14][15] photosynthetic complexes, 16 and atomic vapors. 17,18 Whereas Fourier transform spectroscopy in the infrared domain and longer wavelengths is done routinely, 19 its implementation is more challenging for the visible and near infrared ranges, since in this case passive stabilization is generally insufficient to maintain sub-wavelength control of the inter-pulse delays.…”

Section: Introductionmentioning

confidence: 99%

Multi-dimensional coherent optical spectroscopy of semiconductor nanostructures: Collinear and non-collinear approaches

Nardin

Autry

Singh

et al. 2015

Journal of Applied Physics

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We review our recent work on multi-dimensional coherent optical spectroscopy (MDCS) of semiconductor nanostructures. Two approaches, appropriate for the study of semiconductor materials, are presented and compared. A first method is based on a non-collinear geometry, where the Four-Wave-Mixing (FWM) signal is detected in the form of a radiated optical field. This approach works for samples with translational symmetry, such as Quantum Wells (QWs) or large and dense ensembles of Quantum Dots (QDs). A second method detects the FWM in the form of a photocurrent in a collinear geometry. This second approach extends the horizon of MDCS to sub-diffraction nanostructures, such as single QDs, nanowires, or nanotubes, and small ensembles thereof. Examples of experimental results obtained on semiconductor QW structures are given for each method. In particular, it is shown how MDCS can assess coupling between excitons confined in separated QWs.

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Two-dimensional Fourier-transform spectroscopy of potassium vapor

Cited by 55 publications

References 43 publications

Role of strain on the coherent properties of GaAs excitons and biexcitons

Role of strain on the coherent properties of GaAs excitons and biexcitons

Two-Dimensional Electronic Spectroscopy Using Incoherent Light: Theoretical Analysis

Multi-dimensional coherent optical spectroscopy of semiconductor nanostructures: Collinear and non-collinear approaches

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